LESSON -2 Rates Lesson Objectives Find and compare unit rates, such as average speed and unit price Vocabulary rate (p. 218) unit rate (p. 218) Additional Examples Example 1 Find each rate. A. A Ferris wheel revolves 35 times in 105 minutes. How many minutes does 1 revolution take? minutes 1 revolution minutes revolutions minutes revolutions The Ferris wheel takes Write a rate that compares minutes and revolutions. by. minutes for 1 revolution. 100 Holt McDougal Mathematics
B. Sue walks yards and passes 2 security lights set along the sidewalk. How many security lights does she pass in 1 yard? lights yards lights yards Write a rate that compares lights and yards. by. lights 1 yard Sue walks past security lights in 1 yard. Example 2 Danielle is cycling 8 miles as a fundraising commitment. She wants to complete her ride in hours. What should be her average speed in miles per hour? miles Write the rate as a fraction. hours miles hours miles 1 hour by. Her average speed should be miles per hour. 101 Holt McDougal Mathematics
Example 3 A 12-ounce sports drink costs 0.99, and a 1-ounce drink costs 1.19. Which size is the better buy? Divide the by the number of () to find the unit price of each size. Since, the - sports drink is the better buy. Check It Out! 1. Find the rate. A car gets 189 miles with 9 gallons of gas. How many miles does the car get in 1 gallon of gas? 2. Danielle is walking 18 miles for charity. She wants to complete her walk in 3 hours. What should be her average speed in miles per hour? 3. A 28-ounce box of cereal costs 2.99, and a 32-ounce box of cereal costs 3.19. Which size is the better buy? 102 Holt McDougal Mathematics
LESSON -2 Rates Lesson Objectives Find and compare unit rates, such as average speed and unit price Vocabulary rate (p. 218) A ratio that compares two quantities measured in different units. unit rate (p. 218) A rate whose denominator is 1 when it is written as a fraction. Additional Examples Example 1 Find each rate. A. A Ferris wheel revolves 35 times in 105 minutes. How many minutes does 1 revolution take? 105 35 105 35 minutes revolutions minutes 35 revolutions 35 Write a rate that compares minutes and revolutions. by 35. 3 minutes 1 revolution The Ferris wheel takes 3 minutes for 1 revolution. 100 Holt McDougal Mathematics
B. Sue walks yards and passes 2 security lights set along the sidewalk. How many security lights does she pass in 1 yard? 2 lights yards Write a rate that compares lights and yards. 2 lights yards by. lights 1 yard Sue walks past security lights in 1 yard. Example 2 Danielle is cycling 8 miles as a fundraising commitment. She wants to complete her ride in hours. What should be her average speed in miles per hour? 8 miles Write the rate as a fraction. hours 8 miles hours 17 miles 1 hour by the denominator. Her average speed should be 17 miles per hour. 101 Holt McDougal Mathematics
Example 3 A 12-ounce sports drink costs 0.99, and a 1-ounce drink costs 1.19. Which size is the better buy? Divide the price by the number of ounces () to find the unit price of each size. 0.99 12 0.08 1.19 1 0.07 Since 0.07 0.08, the 1 - sports drink is the better buy. Check It Out! 1. Find the rate. A car gets 189 miles with 9 gallons of gas. How many miles does the car get in 1 gallon of gas? 21 2. Danielle is walking 18 miles for charity. She wants to complete her walk in 3 hours. What should be her average speed in miles per hour? miles per hour 3. A 28-ounce box of cereal costs 2.99, and a 32-ounce box of cereal costs 3.19. Which size is the better buy? the 32-ounce box 102 Holt McDougal Mathematics